You can try:
1.Open Control Panel
2.Change "View By: Large Icons"
3.Administrative tools
4.Computer Management
5.Under "Storage" click on "Disk Management"
6.Select the partition you want to change/hide
7. Right click it. In the context menu click "Change Drive Letter and paths..."
-------------------------
Hope this helps somehow.
I dont really see the point of hiding the partition from other OS, maybe just for Virus protection?
And if you hide that partition, I think the MBR might not find the OS partition and not boot it.
-----------------------
And if you just want to hide it from the Windows explorer:
1. Open up regedit.exe by using the start menu search box, and then browse down to the following key.
Code:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
2.The NoDrives key most likely does not exist by default, so you’ll need to create it with right-click \ new 32-bit DWORD and name it NoDrives.
3.Now Right click it, and select Modify
4.Select the Decimal(Radio button)
5.In the "Value data:" you need to write a number corresponding to the drive letter.
EXAMPLE:
Drive Letter Number
A 1
B 2
C 4
D 8
E 16
F 32
G 64
H 128
In order to see these changes, you’ll need to restart explorer.exe, which you can do easily from Task Manager or the longer way by just logging off and back on.
And so on :)
Hope this helps!